EP2984348A1 - Pump impeller - Google Patents
Pump impellerInfo
- Publication number
- EP2984348A1 EP2984348A1 EP14849056.8A EP14849056A EP2984348A1 EP 2984348 A1 EP2984348 A1 EP 2984348A1 EP 14849056 A EP14849056 A EP 14849056A EP 2984348 A1 EP2984348 A1 EP 2984348A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- impeller
- pump
- impeller according
- main body
- central axis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2205—Conventional flow pattern
- F04D29/2216—Shape, geometry
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2238—Special flow patterns
- F04D29/225—Channel wheels, e.g. one blade or one flow channel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2238—Special flow patterns
- F04D29/2255—Special flow patterns flow-channels with a special cross-section contour, e.g. ejecting, throttling or diffusing effect
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2261—Rotors specially for centrifugal pumps with special measures
- F04D29/2294—Rotors specially for centrifugal pumps with special measures for protection, e.g. against abrasion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
- F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
Definitions
- This disclosure relates generally to impellers for pumps and more particularly but not exclusively to centrifugal slurry pumps for handling slurries which are usually a mixture of liquid and particulate solids, and are commonly encountered in the minerals processing, sand and gravel and/or dredging industry.
- Centrifugal slurry pumps generally include a pump housing having a pumping chamber therein which may be of a volute configuration with an impeller mounted for rotation within the pumping chamber.
- a drive shaft is operatively connected to the pump impeller for causing rotation thereof, the drive shaft entering the pump housing from one side.
- the pump further includes a pump inlet which is typically coaxial with respect to the drive shaft and located on the opposite side of the pump housing to the drive shaft. There is also a discharge outlet typically located at a periphery of the pump housing.
- the impeller typically includes a hub to which the drive shaft is operatively connected and at least one shroud.
- Pumping vanes are provided on one side of the shroud with discharge passageways between adjacent pumping vanes.
- two shrouds are provided with the pumping vanes being disposed therebetween.
- the pump impeller is adapted to be run at different speeds to generate the required pressure head.
- EP 146027 and US 2003/0215343 disclose pumps which include an electric motor having a rotor to which an impeller is attached. In essence the impeller in each of these documents is conventional.
- the spherical, or part-spherical, rotor serves to house the magnet forming part of the electric motor.
- US 3,476,488 discloses a spherical pump housing, but again the impeller is essentially conventional in structure.
- DE 344907 discloses a pump which is used in situations where reverse flows are required, such as in recirculating heating pumps and pumps in filter systems.
- the pump has a pump casing 10 with a chamber therein for receiving a spherical impeller 11 rotatable by drive shaft 12.
- the spherical impeller 11 comprises two hemispherical sections each being associated with a respective flow channel 14, and each channel 14 being capable of functioning as a fluid intake channel or a discharge channel depending on the direction of rotation of the impeller.
- a series of tubes are disposed within the impeller extending from one side of the spherical impeller to the other side.
- the pumping chamber has recessed sections 31 which facilitate flow of fluid from one flow channel to the other intake/discharge channel and therefore the flow direction is at right angles to the impeller rotation axis and the tubes have 90° bends therein.
- an impeller for a pump comprising a main body which in use is rotatable about a central axis, the main body including a front side and a rear side, the front side having a generally spherical cap like or dome shaped surface with an apex region in the vicinity of the central axis and a peripheral outer region in the vicinity of the rear side, a plurality of channels extending through the main body each having an inlet opening and an outlet opening, the inlet openings being in the vicinity of the apex region and the outlet openings being in the vicinity of the peripheral outer region.
- the channels are curved in a direction between the inlet opening and outlet opening. In certain embodiments at least a part of the channel surface provides for a pumping surface. In certain embodiments the distance of each channel with respect to the central axis progressively increases in the radial direction when moving from the inlet opening to the outlet opening.
- the inlet openings are spaced around the central axis. In certain embodiments the outlet openings are spaced around the peripheral outer region.
- the inlet openings are generally oval or elliptically shaped and have a long or major axis, the long or major axis being inclined to the central axis.
- the outlet openings are generally oval or elliptically shaped and have a long or major axis the long or major axis generally following the periphery of the peripheral outer region.
- the inlet openings have a curved leading edge portion.
- the main body includes a central mount to which a pump drive shaft can be operatively fitted.
- the rear side comprises a recessed face.
- auxiliary pump out vanes are provided on the recessed face.
- a cover overlies the recess face.
- a pump intake device for use with an impeller as described in the first aspect, the pump intake device comprising an outer section comprising a conduit having an inner surface and an inner section having an inner profiled surface which is substantially similar in profile to part of the impeller surface.
- the inner surface of the outer section diverges or curves outwardly. In certain embodiments the inner surface of the outer section and the inner profiled surface of the inner section provide a continuous curving surface between regions adjacent opposed ends of the device.
- a pump comprising a pump casing which includes a main casing part and front side casing part comprising a pump intake device as described in the second aspect, and an impeller as described in the first aspect mounted within the pump casing.
- Figure 1 is an isometric view of a pump impeller according to one embodiment of the present disclosure
- Figure 2 is an first side elevation of the pump impeller shown in Figure 1 ;
- Figure 3 is a second side elevation of the pump impeller shown in Figures 1 and 2;
- Figure 4 is a front elevation of the pump impeller shown in Figures 1 to 3;
- Figure 5 and 6 are sectional views of the pump impeller shown in Figures 1 to 4;
- Figure 7 is a sectional view of a pump impeller according to a further embodiment
- Figure 8 is a sectional view of a pump impeller according to a further embodiment.
- Figure 9 is a schematic view partially in section of a pump assembly according to one embodiment.
- a pump assembly 50 which includes a pump 51 having a pump casing 60 which is mounted to a pump casing support or pedestal 55.
- the pump casing 60 comprises a main casing part (or volute) 61, a front side casing part 62 and a rear side casing part 63 which, when assembled together provide for a pumping chamber 68 located therein.
- the front side casing part 62 is in the form of a pump intake device 70 through which the fluid to be pumped enters the pumping chamber 68.
- the rear side casing part 62 provides for a seal chamber housing 90.
- a pump impeller 10 is disposed within the pumping chamber 68 and is operatively connected to a drive shaft 53 for rotation about a central axis X-X.
- the impeller 10 comprises a main body 12 with a front side 14 and a rear side 16.
- the front side 14 has a generally dome-shaped, or spherical cap-like, outer surface 18 (that is, the region of a sphere disposed to one side of a given plane) having an apex region 20 in the vicinity of the central axis X-X and a peripheral outer region 22 adjacent the rear side 16.
- the outer surface may for example be generally hemispherical in shape but is not limited to that shape.
- the apex region 20 is the forward-most part of the main body 12 and faces the pump inlet when in an assembled position.
- the impeller 10 is positioned within a pump housing or casing 50 having an inlet 51 and an outlet 52, the apex region 20 of the main body facing the inlet 51.
- the impeller 10 further includes a plurality of channels which extend through the main body 12 of the impeller 10.
- a plurality of channels which extend through the main body 12 of the impeller 10.
- Each channel has an inlet opening and an outlet opening;
- channel 25 has an inlet opening 31 and an outlet opening 35;
- channel 26 has an inlet opening 32 and an outlet opening 36;
- channel 27 has an inlet opening 33 and an outlet opening 37;
- channel 28 has an inlet opening 34 and an outlet opening 38.
- the inlet openings 31, 32, 33 and 34 are in the vicinity of the apex region 20 and are spaced around the central axis X-X.
- the inlet openings are generally oval in shape each having a major axis Y-Y. As shown the major axes Y-Y are inclined to the central axis X-X and are arranged offset to one another as well as one behind the other, around the central axis X-X. Each inlet opening has a curved (or blended) leading edge 39 to facilitate fluid entry.
- the distance of each channel away from the central axis X-X progressively increases in a general radial direction when moving from the inlet openings 31, 32, 33, 34 to the respective outlet openings 35, 36, 37, 38, for example as can be seen in dotted outline in Figure 2 in relation to one exemplary channel 27. With reference to Figure 1 , the continuation of channel 27 can be seen beyond a bend therein.
- the channels 25, 26, 27, 28 are in the form of a tube or tube-like formation or passageway, having a generally oval-shaped cross section which progressively increases in cross-sectional area when moving in a direction from the inlet openings 31, 32, 33, 34 to the respective outlet openings 35, 36, 37, 38.
- the configuration and path of one exemplary channel 25 through the impeller body 12 is illustrated by phantom lines in Figures 1 and 4.
- the configuration and path of a further exemplary channel 27 is illustrated by phantom lines in Figure 2.
- the configuration and path of a further exemplary channel 26 is illustrated by phantom lines in Figure 3. Only one channel has been illustrated in each of the Figures 1, 2, 3 and 4 for reasons of clarity.
- the channel 25 follows a curved path from the inlet opening 31 to the outlet opening 35.
- Each of the other channels 26, 27, 28 is of similar configuration.
- the progressive increase in cross sectional area of the channels 25, 26, 27, 28 is analogous to the shaping of the channels formed between pumping vanes and shrouds of conventional impellers.
- the distinction between the shape of the channels formed in a conventional impeller and the channels 25, 26, 27, 28 of the impeller which is the subject of this disclosure, resides in their oval cross section, which is believed to reduce the formation of vortices as a fluid moves through the channels 25, 26, 27, 28, as compared to the situation in conventional impellers, as will now be described.
- the outlet openings 35, 36, 37 and 38 are also generally oval shaped having a major axis Z-Z.
- the major axes Z-Z are arranged so as to follow around the peripheral outer region one behind the other and offset to one another.
- the rear side 16 of the main body 12 has a recess or void 40 therein which as shown in Figures 7 and 8, and over which a back cover 45 can be received.
- the back cover 45 is generally frusto-conical in shape having a curved side.
- Auxiliary expeller vanes 47 may be provide on the back cover as shown in Figure 8.
- a drive shaft mount 42 is provided in the main body at the central axis X-X for fitting the drive shaft 53 thereto ( Figure 8).
- the front side casing part 62 is in the form of a pump intake device 70 which comprises an outer (forward) section 72 generally shaped in the form of a conduit 73, and an inner section 74 which is operatively connected to the main casing part 61.
- the pump intake device 70 is of a one piece construction.
- the inner section 74 has an inner profiled surface 77 which follows closely in shape a part of the surface 18 of the impeller 10, so that in the assembled position there is a small gap therebetween.
- the outer section 72 has an inner surface 78 which diverges or curves outwardly from the central axis X-X and smoothly joins the profiled surface 77 which in turn curves inwardly.
- the overall inner surface of the intake device provides for a smooth, continuously-curving surface which terminates at an end section 75.
- the pump intake device 70 is generally bell- shape with convex inner surface portion in the outer section, and a concave inner surface portion in the inner section.
- the impeller 10 can offer reduced fluid turbulence and vortices generated when in use, when compared to a conventional pumping impeller, which in turn will lead to a relative reduction in wear of the impeller while at the same time producing similar levels of head pressure and efficiency to that of a conventional impeller.
- the reduction in the amount of vortices in the pumping channels has already been described.
- the skin friction over the spherical or dome shaped front side surface will be minimised, thus reducing wear which normally occurs as a result of small particles which become entrained in the boundary layer of the slurry on the surface of the front side of a moving impeller.
- the impeller does not have a back shroud, for this reason the void space in the body is covered by a lid or back cover, which can be plain or contain the back vanes as illustrated in Figure 8 which are needed to hydraulically seal the gap between the impeller and the pump liner.
- outlets of the impeller channels 25, 26, 27, 28 also have an oval shape, and their edges have an optimized rounded shape to induce a smooth transition impeller/volute.
- the purpose is also to reduce the turbulence generated by the interaction between this impeller outlet surface and the fluid which is just leaving the impeller's channel.
- impeller which is the subject of this disclosure, is quite different to the conventional design of a centrifugal pump impeller which involves two shrouds with pumping vanes disposed therebetween.
- the level of erosion intensity of a fluid passing into the impeller which is the subject of this disclosure was also simulated using Computational Fluid Dynamics (CFD).
- CFD Computational Fluid Dynamics
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2013901228A AU2013901228A0 (en) | 2013-04-10 | Pump impeller | |
PCT/AU2014/000397 WO2015042634A1 (en) | 2013-04-10 | 2014-04-10 | Pump impeller |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2984348A1 true EP2984348A1 (en) | 2016-02-17 |
EP2984348A4 EP2984348A4 (en) | 2016-11-16 |
Family
ID=52741623
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14849056.8A Withdrawn EP2984348A4 (en) | 2013-04-10 | 2014-04-10 | Pump impeller |
Country Status (7)
Country | Link |
---|---|
US (1) | US20160061213A1 (en) |
EP (1) | EP2984348A4 (en) |
CN (1) | CN105102820A (en) |
AU (1) | AU2014328453A1 (en) |
CA (1) | CA2906748A1 (en) |
CL (1) | CL2015002998A1 (en) |
WO (1) | WO2015042634A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10392087B2 (en) * | 2009-07-23 | 2019-08-27 | Jose Angel Acosta | Peripheral tunnels propeller with alternative balance |
WO2022266725A1 (en) * | 2021-06-25 | 2022-12-29 | Weir Minerals Australia Ltd | Centrifugal pump impeller with tapered shroud |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE344907C (en) | 1917-05-15 | 1921-12-02 | Boston | Manufacture of molds for shoe soles from two different metals |
SE316376B (en) | 1966-11-04 | 1969-10-20 | Svenska Maskinverken Ab | |
US4521325A (en) | 1983-12-12 | 1985-06-04 | Olin Corporation | Selected N,1-disubstituted hydrazinecarboxamides and their use as antioxidants |
DE3444907A1 (en) * | 1984-12-08 | 1986-06-12 | Reinhard 4410 Warendorf Rolf | Centrifugal pump |
US6524066B2 (en) * | 2001-01-31 | 2003-02-25 | Bruno H. Thut | Impeller for molten metal pump with reduced clogging |
US6736616B2 (en) | 2002-05-20 | 2004-05-18 | Oliver Laing | Centrifugal pump with integrated motor |
EP1460275B1 (en) * | 2003-03-21 | 2005-07-27 | Grundfos A/S | Motor pump |
DE102006009495A1 (en) * | 2006-02-27 | 2007-08-30 | Oase Gmbh | Water pump, for garden ponds and aquaria, has a diagonal impeller with the water inflow and outflow at right angles to each other in the pump housing |
KR101070136B1 (en) * | 2011-02-22 | 2011-10-05 | 이재웅 | Impeller including cylinder type vanes |
-
2014
- 2014-04-10 AU AU2014328453A patent/AU2014328453A1/en not_active Abandoned
- 2014-04-10 EP EP14849056.8A patent/EP2984348A4/en not_active Withdrawn
- 2014-04-10 WO PCT/AU2014/000397 patent/WO2015042634A1/en active Application Filing
- 2014-04-10 CN CN201480020362.5A patent/CN105102820A/en active Pending
- 2014-04-10 CA CA2906748A patent/CA2906748A1/en not_active Abandoned
- 2014-04-10 US US14/783,587 patent/US20160061213A1/en not_active Abandoned
-
2015
- 2015-10-08 CL CL2015002998A patent/CL2015002998A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
CA2906748A1 (en) | 2015-04-02 |
WO2015042634A8 (en) | 2015-10-22 |
US20160061213A1 (en) | 2016-03-03 |
EP2984348A4 (en) | 2016-11-16 |
CL2015002998A1 (en) | 2016-09-02 |
AU2014328453A1 (en) | 2015-11-26 |
CN105102820A (en) | 2015-11-25 |
WO2015042634A1 (en) | 2015-04-02 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 20151109 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
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AX | Request for extension of the european patent |
Extension state: BA ME |
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A4 | Supplementary search report drawn up and despatched |
Effective date: 20161018 |
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RIC1 | Information provided on ipc code assigned before grant |
Ipc: F04D 29/22 20060101ALI20161012BHEP Ipc: F04D 1/00 20060101ALI20161012BHEP Ipc: F04D 29/54 20060101ALI20161012BHEP Ipc: F04D 29/66 20060101ALI20161012BHEP Ipc: F04D 29/40 20060101ALI20161012BHEP Ipc: F04D 7/04 20060101AFI20161012BHEP |
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GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
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RIC1 | Information provided on ipc code assigned before grant |
Ipc: F04D 29/66 20060101ALI20171207BHEP Ipc: F04D 7/04 20060101AFI20171207BHEP Ipc: F04D 29/54 20060101ALI20171207BHEP Ipc: F04D 1/00 20060101ALI20171207BHEP Ipc: F04D 29/22 20060101ALI20171207BHEP Ipc: F04D 29/40 20060101ALI20171207BHEP Ipc: F04D 29/42 20060101ALI20171207BHEP |
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INTG | Intention to grant announced |
Effective date: 20180104 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20180515 |